Dipanjan Mukherjee, Dipankar Bhattacharya
In this paper we make a phase dependent study of the effect of the distortion
of local magnetic field due to confinement of accreted matter in X-ray pulsars
on the cyclotron spectra emitted from the hotspot . We have numerically solved
the Grad-Shafranov equation for axisymmetric static MHD equilibria of matter
confined at the polar cap of neutron stars. From our solution we model the
cyclotron spectra that will be emitted from the region, using a simple
prescription and integrating over the entire mound. Radiative transfer through
the accretion column overlying the mound may significantly modify the spectra
in comparison to those presented here. However we ignore this in the present
paper in order to expose the effects directly attributable to the mound itself.
We perform a spin phase dependent analysis of the spectra to study the effect
of the viewing geometry.
View original:
http://arxiv.org/abs/1110.2850
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